This document summarizes a presentation about analyzing performance through measuring response times at a task level. It discusses that performance is about the time it takes to complete tasks, and that throughput can only be optimized after first analyzing response times to find inefficiencies. It promotes using profiling tools to get call-by-call data on where time is spent for tasks, rather than guessing, and provides examples of insights found from measuring response times, such as disk I/O often being less important than thought. The key messages are that measuring response times is essential to understand and improve performance, and that problems cannot be hidden when you can see where time is spent on each task.
Object Oriented Css For High Performance Websites And ApplicationsPerconaPerformance
The document discusses object-oriented CSS (OOCSS) as a way to improve performance, code reuse, and maintainability of CSS code for websites and applications. It outlines several principles of OOCSS including creating reusable CSS components, separating container and content rules, extending objects by applying multiple classes, avoiding location-dependent styles, and separating structure from skin. Examples are provided to illustrate these concepts. The goal of OOCSS is to write more modular, predictable and maintainable CSS code.
This document discusses strategies for maximizing the use of slave databases in MySQL replication. It begins by outlining some common problems with scaling through multiple slaves, such as high write rates limiting reads per slave and inefficient slave resource utilization. It then provides recommendations for reducing write rates through query optimization and selective data replication. The document also discusses ways to better utilize slave resources like specialized storage engines and indexes on different slaves. Finally, it covers approaches for applications to integrate reads from slaves while handling stale data, such as query-based, session-based, and data versioning techniques.
The document discusses Erlang and scalability. It introduces common scalability killers like synchronization and resource contention. It describes Erlang's design decisions that promote scalability, including processes with no sharing, no implicit synchronization, and concurrency-oriented programming. The document provides examples of thinking concurrently, rules of thumb for scalability, and case studies showing how Erlang scales on multicore systems.
This document contains the slides and notes from a presentation by Philip Tellis on optimizing website speed. The presentation covers identifying factors that slow down websites, such as images, JavaScript, and CSS files. It then discusses techniques to improve performance, including minimizing file sizes, combining files, caching content, optimizing when resources are loaded, and profiling JavaScript. Specific tools are also recommended for tasks like minifying files and optimizing images. The presentation aims to teach the audience how to determine what makes websites slow and how to make them faster through technical optimizations and page structuring.
This document discusses database performance issues that can arise with proxy architectures and introduces Tungsten SQL Router as an alternative. Tungsten SQL Router is an embeddable library that provides intelligent failover, load balancing and partitioning for databases in a way that avoids the overhead of traditional proxies. It uses a connection-level routing approach based on the CAP theorem to balance consistency, availability and partition tolerance.
The document summarizes a Portland Performance Practice Project that teaches people about optimizing PostgreSQL performance. The project holds monthly meetings to discuss bottlenecks, baselining techniques like starting from defaults and changing one thing at a time, and constraints like hardware limitations. It also discusses how PostgreSQL thinks about performance internally with techniques like synchronized scans to piggyback on sequential scans, HOT updates to avoid updating indexes unnecessarily, and visibility maps to reduce VACUUM costs. The project organizers are seeking help analyzing their performance data and asking additional questions.
This document summarizes a presentation about analyzing performance through measuring response times at a task level. It discusses that performance is about the time it takes to complete tasks, and that throughput can only be optimized after first analyzing response times to find inefficiencies. It promotes using profiling tools to get call-by-call data on where time is spent for tasks, rather than guessing, and provides examples of insights found from measuring response times, such as disk I/O often being less important than thought. The key messages are that measuring response times is essential to understand and improve performance, and that problems cannot be hidden when you can see where time is spent on each task.
Object Oriented Css For High Performance Websites And ApplicationsPerconaPerformance
The document discusses object-oriented CSS (OOCSS) as a way to improve performance, code reuse, and maintainability of CSS code for websites and applications. It outlines several principles of OOCSS including creating reusable CSS components, separating container and content rules, extending objects by applying multiple classes, avoiding location-dependent styles, and separating structure from skin. Examples are provided to illustrate these concepts. The goal of OOCSS is to write more modular, predictable and maintainable CSS code.
This document discusses strategies for maximizing the use of slave databases in MySQL replication. It begins by outlining some common problems with scaling through multiple slaves, such as high write rates limiting reads per slave and inefficient slave resource utilization. It then provides recommendations for reducing write rates through query optimization and selective data replication. The document also discusses ways to better utilize slave resources like specialized storage engines and indexes on different slaves. Finally, it covers approaches for applications to integrate reads from slaves while handling stale data, such as query-based, session-based, and data versioning techniques.
The document discusses Erlang and scalability. It introduces common scalability killers like synchronization and resource contention. It describes Erlang's design decisions that promote scalability, including processes with no sharing, no implicit synchronization, and concurrency-oriented programming. The document provides examples of thinking concurrently, rules of thumb for scalability, and case studies showing how Erlang scales on multicore systems.
This document contains the slides and notes from a presentation by Philip Tellis on optimizing website speed. The presentation covers identifying factors that slow down websites, such as images, JavaScript, and CSS files. It then discusses techniques to improve performance, including minimizing file sizes, combining files, caching content, optimizing when resources are loaded, and profiling JavaScript. Specific tools are also recommended for tasks like minifying files and optimizing images. The presentation aims to teach the audience how to determine what makes websites slow and how to make them faster through technical optimizations and page structuring.
This document discusses database performance issues that can arise with proxy architectures and introduces Tungsten SQL Router as an alternative. Tungsten SQL Router is an embeddable library that provides intelligent failover, load balancing and partitioning for databases in a way that avoids the overhead of traditional proxies. It uses a connection-level routing approach based on the CAP theorem to balance consistency, availability and partition tolerance.
The document summarizes a Portland Performance Practice Project that teaches people about optimizing PostgreSQL performance. The project holds monthly meetings to discuss bottlenecks, baselining techniques like starting from defaults and changing one thing at a time, and constraints like hardware limitations. It also discusses how PostgreSQL thinks about performance internally with techniques like synchronized scans to piggyback on sequential scans, HOT updates to avoid updating indexes unnecessarily, and visibility maps to reduce VACUUM costs. The project organizers are seeking help analyzing their performance data and asking additional questions.
Galera Multi Master Synchronous My S Q L Replication ClustersPerconaPerformance
Galera Replication provides multi-master synchronous replication for MySQL databases using a certification-based replication model. It avoids middleware and connects databases directly for transparency. Benchmarking shows it provides good scalability even under write-intensive workloads. Features include high availability, transparency, and the ability to retry aborted transactions.
This document summarizes Kazuho Oku's presentation on running a real-time stats service on MySQL. Some key points:
1) Oku described Pathtraq, a web ranking service in Japan that collects over 1 million access records per day from 10,000 users.
2) To provide real-time analysis of this data, compressed tables are stored in RAM to avoid slow random access on HDD. Custom compression algorithms were developed to compress URLs and access stats.
3) Additional optimizations included creating a message queue, limiting pre-computation loads, and developing an in-memory cache system with locking to minimize database queries.
This document provides a summary of various ICT tools and ideas for using them in education, compiled in May 2008. It outlines examples of using blogs for publishing writing, sharing classroom experiences, and teacher reflection. It also discusses using wikis and VoiceThread for collaborative projects. Other tools mentioned include Flickr for adding notes to images, podcasting to share learning between classes, and making movies using tools like KidPix to demonstrate skills or concepts. A wide range of online games and movies are also presented as ideas to engage students.
The document discusses various techniques for representing hierarchical or tree data in PostgreSQL, including common table expressions (CTEs), materialized path enumeration, and nested sets. It provides code examples for querying employee hierarchy data using a CTE to return the organizational tree structure. The document also covers using CTEs to model and solve the traveling salesman problem (TSP) of finding the shortest route between cities.
This document contains the slides from Philip Tellis' presentation on optimizing website speed. The presentation covers identifying factors that slow down websites, such as DNS lookups, downloading content, and rendering pages. It then provides tips to improve performance, such as reducing HTTP requests, minimizing content size through techniques like gzipping and image optimization, caching content, and structuring pages in a way that speeds up loading and rendering. Specific tools are also recommended for tasks like minifying JavaScript and CSS.
This document describes EMT, a tool for collecting and storing system monitoring data. EMT can run plugins to collect metrics from services, store the data locally, and send it for archiving. The data is organized by instances, fields, and sub-fields. Users can query and view the stored data using the emt_view command line tool. Plugins are configured using a my.cnf style file to define what to monitor and store. The goal of EMT is to provide a simple way to collect, store, and access system monitoring data.
Drizzles Approach To Improving Performance Of The ServerPerconaPerformance
The document discusses Drizzle's approach to database performance. It values open discussion, a focus on interfaces over implementations, avoiding "magic" code, and using standard libraries. It also discusses cleaning up Drizzle's codebase to make it easier for developers to contribute. The document then provides an example of complex code that "makes baby kittens cry" and could benefit from refactoring.
This document discusses using MySQL 5.1 partitions to boost performance with large datasets. It begins with an introduction of the author Giuseppe Maxia. It then discusses defining problems with too much data like not enough RAM. It explains what partitions are, how to create them, and when they should be used, such as for large tables or historical data. Hands-on examples are provided using the MySQL employees test database partitioned by year. Partitions provided faster queries and deleting of records compared to non-partitioned tables. Some pitfalls and best practices are also covered.
This document discusses how to implement automated performance testing using Maven and JMeter. It describes configuring Maven to run JMeter tests as part of a continuous integration build cycle. Running performance tests automatically allows issues to be detected quickly before code is deployed. The process involves packaging JMeter tests with Maven, configuring Maven profiles and plugins to run tests across different environments and datasets, and using tools like Chronos and Bamboo for reporting and comparing performance over time.
Galera Multi Master Synchronous My S Q L Replication ClustersPerconaPerformance
Galera Replication provides multi-master synchronous replication for MySQL databases using a certification-based replication model. It avoids middleware and connects databases directly for transparency. Benchmarking shows it provides good scalability even under write-intensive workloads. Features include high availability, transparency, and the ability to retry aborted transactions.
This document summarizes Kazuho Oku's presentation on running a real-time stats service on MySQL. Some key points:
1) Oku described Pathtraq, a web ranking service in Japan that collects over 1 million access records per day from 10,000 users.
2) To provide real-time analysis of this data, compressed tables are stored in RAM to avoid slow random access on HDD. Custom compression algorithms were developed to compress URLs and access stats.
3) Additional optimizations included creating a message queue, limiting pre-computation loads, and developing an in-memory cache system with locking to minimize database queries.
This document provides a summary of various ICT tools and ideas for using them in education, compiled in May 2008. It outlines examples of using blogs for publishing writing, sharing classroom experiences, and teacher reflection. It also discusses using wikis and VoiceThread for collaborative projects. Other tools mentioned include Flickr for adding notes to images, podcasting to share learning between classes, and making movies using tools like KidPix to demonstrate skills or concepts. A wide range of online games and movies are also presented as ideas to engage students.
The document discusses various techniques for representing hierarchical or tree data in PostgreSQL, including common table expressions (CTEs), materialized path enumeration, and nested sets. It provides code examples for querying employee hierarchy data using a CTE to return the organizational tree structure. The document also covers using CTEs to model and solve the traveling salesman problem (TSP) of finding the shortest route between cities.
This document contains the slides from Philip Tellis' presentation on optimizing website speed. The presentation covers identifying factors that slow down websites, such as DNS lookups, downloading content, and rendering pages. It then provides tips to improve performance, such as reducing HTTP requests, minimizing content size through techniques like gzipping and image optimization, caching content, and structuring pages in a way that speeds up loading and rendering. Specific tools are also recommended for tasks like minifying JavaScript and CSS.
This document describes EMT, a tool for collecting and storing system monitoring data. EMT can run plugins to collect metrics from services, store the data locally, and send it for archiving. The data is organized by instances, fields, and sub-fields. Users can query and view the stored data using the emt_view command line tool. Plugins are configured using a my.cnf style file to define what to monitor and store. The goal of EMT is to provide a simple way to collect, store, and access system monitoring data.
Drizzles Approach To Improving Performance Of The ServerPerconaPerformance
The document discusses Drizzle's approach to database performance. It values open discussion, a focus on interfaces over implementations, avoiding "magic" code, and using standard libraries. It also discusses cleaning up Drizzle's codebase to make it easier for developers to contribute. The document then provides an example of complex code that "makes baby kittens cry" and could benefit from refactoring.
This document discusses using MySQL 5.1 partitions to boost performance with large datasets. It begins with an introduction of the author Giuseppe Maxia. It then discusses defining problems with too much data like not enough RAM. It explains what partitions are, how to create them, and when they should be used, such as for large tables or historical data. Hands-on examples are provided using the MySQL employees test database partitioned by year. Partitions provided faster queries and deleting of records compared to non-partitioned tables. Some pitfalls and best practices are also covered.
This document discusses how to implement automated performance testing using Maven and JMeter. It describes configuring Maven to run JMeter tests as part of a continuous integration build cycle. Running performance tests automatically allows issues to be detected quickly before code is deployed. The process involves packaging JMeter tests with Maven, configuring Maven profiles and plugins to run tests across different environments and datasets, and using tools like Chronos and Bamboo for reporting and comparing performance over time.